Search Publications
Unscrambling the Lensed Galaxies in JWST Images behind SMACS 0723
Wilkins, Stephen M.; Broadhurst, Tom; Frye, Brenda L. +16 more
The first deep field images from the James Webb Space Telescope (JWST) of the galaxy cluster SMACS J0723.3-7327 reveal a wealth of new lensed images at uncharted infrared wavelengths, with unprecedented depth and resolution. Here we securely identify 14 new sets of multiply imaged galaxies totaling 42 images, adding to the five sets of bright and …
Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA): Hubble Space Telescope Discovers Double Quasars
Shen, Yue; Zakamska, Nadia L.; Chen, Yu-Ching +4 more
Dual supermassive black holes (SMBHs) at ~kiloparsec scales are the progenitor population of SMBH mergers and play an important role in understanding the pairing and dynamical evolution of massive black holes in galaxy mergers. Because of the stringent resolution requirement and the apparent rareness of these small-separation pairs, there are scar…
An exomoon survey of 70 cool giant exoplanets and the new candidate Kepler-1708 b-i
Bryson, Steve; Kipping, David; Szulágyi, Judit +6 more
Exomoons represent a crucial missing puzzle piece in our efforts to understand extrasolar planetary systems. To address this deficiency, we here describe an exomoon survey of 70 cool, giant transiting exoplanet candidates found by Kepler. We identify only one exhibiting a moon-like signal that passes a battery of vetting tests: Kepler-1708 b. We s…
PDRs4All: A JWST Early Release Science Program on Radiative Feedback from Massive Stars
Hartigan, Patrick; Zhang, Yong; Gordon, Karl D. +134 more
Massive stars disrupt their natal molecular cloud material through radiative and mechanical feedback processes. These processes have profound effects on the evolution of interstellar matter in our Galaxy and throughout the universe, from the era of vigorous star formation at redshifts of 1-3 to the present day. The dominant feedback processes can …
Let the Great World Spin: Revealing the Stormy, Turbulent Nature of Young Giant Exoplanet Analogs with the Spitzer Space Telescope
Metchev, Stanimir; Marley, Mark; Faherty, Jacqueline K. +5 more
We present a survey for photometric variability in young, low-mass brown dwarfs with the Spitzer Space Telescope. The 23 objects in our sample show robust signatures of youth and share properties with directly imaged exoplanets. We present three new young objects: 2MASS J03492367+0635078, 2MASS J09512690-8023553, and 2MASS J07180871-6415310. We de…
Strong Lyman continuum emitting galaxies show intense C IV λ1550 emission
Chisholm, J.; Schaerer, D.; Ravindranath, S. +7 more
Using the Space Telescope Imaging Spectrograph, we have obtained ultraviolet spectra from ∼1200 to 2000 Å of known Lyman continuum (LyC) emitting galaxies at low redshift (z ∼ 0.3 − 0.4) with varying absolute LyC escape fractions (fesc ∼ 0.01 − 0.72). Our observations include in particular the galaxy J1243+4646, which has the highest kn…
The GALPROP Cosmic-ray Propagation and Nonthermal Emissions Framework: Release v57
Jóhannesson, G.; Moskalenko, I. V.; Porter, T. A.
The past decade has brought impressive advances in the astrophysics of cosmic rays (CRs) and multiwavelength astronomy, thanks to the new instrumentation launched into space and built on the ground. Modern technologies employed by those instruments provide measurements with unmatched precision, enabling searches for subtle signatures of dark matte…
Flares, Rotation, and Planets of the AU Mic System from TESS Observations
Barclay, Thomas; Latham, David W.; Wittenmyer, Robert A. +20 more
AU Mic is a young (~24 Myr), pre-main-sequence M dwarf star that was observed in the first month of science observations of the Transiting Exoplanet Survey Satellite (TESS) and reobserved 2 years later. This target has photometric variability from a variety of sources that is readily apparent in the TESS light curves; spots induce modulation in th…
Optical superluminal motion measurement in the neutron-star merger GW170817
Anderson, Jay; Lu, Wenbin; Mooley, Kunal P.
The afterglow of the binary neutron-star merger GW1708171 gave evidence for a structured relativistic jet2-6 and a link3,7,8 between such mergers and short gamma-ray bursts. Superluminal motion, found using radio very long baseline interferometry3 (VLBI), together with the afterglow light curve provided …
No Such Thing as a Simple Flare: Substructure and Quasi-periodic Pulsations Observed in a Statistical Sample of 20 s Cadence TESS Flares
MacGregor, Meredith A.; Howard, Ward S.
A 20 s cadence Transiting Exoplanet Survey Satellite monitoring campaign of 226 low-mass flare stars during Cycle 3 recorded 3792 stellar flares of ≥1032 erg. We explore the time-resolved emission and substructure in 440 of the largest flares observed at high signal-to-noise, 97% of which released energies of ≥1033 erg. We di…